Chapter C, Problem 22E

a.

To determine

Find the percentage of students in the sample smoke.

Check whether the percentage of all the students at this university who smoke are different from the national percentage.

b.

To determine

Check whether the average math SAT score of students at this university is greater than 600.

c.

To determine

Find the proportion of females in the sample with higher verbal SAT score.

Find the proportion of males in the sample with higher verbal SAT score.

Check whether there is a difference between the proportion of females with a higher verbal score and the proportion of males with a higher verbal score for all the students at this university.

Find and interpret the 95% confidence interval for the difference between the proportions of females with a higher verbal score minus the proportion of males with a higher verbal score.

d.

To determine

Find the higher average pulse rate in the sample.

Check whether there is evidence for a difference in mean pulse rate between smokers and non-smokers for all the students at this university.

e.

To determine

Find the higher average grade point average in the sample.

Check whether there is evidence for a difference in the mean GPA between smokers and non-smokers for all the students at this university.

Check whether the results are significant at a 10% level, at a 5% level, and at a 1% level.